ever time I try to use Firefox, it's broken in so many ways

No it isn't.

They still haven't fixed the address bar on Linux after years

...explain? Been using it for years and have never noticed a problem or difference versus Mac/windows/android versions.

Edit: and no, it doesn't make me a fanboy to say any of this. I use Firefox every day and cannot really think of any way in which it's broken, let alone "in so many ways".